Adorama offers the Ultrasone Pro 550 Over-the-Ear Closed-Back Professional Headphones for $79.99. This $10 mail-in rebate drops it to $69.99. With free shipping, that's $20 under our October mention, $54 off, and the lowest total price we've seen. These foldable circumaural headphones feature 50mm Mylar drivers, a 10Hz to 22kHz frequency response, S-Logic natural surround sound, gold-plated connectors, 10-foot coiled and straight detachable cables, extra earpads, and hard carrying case. Deal ends April 5.